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\usepackage[ruled,vlined]{algorithm2e}

\usepackage{graphicx}
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\begin{document}

\begin{figure}
	\centering
	\captionsetup{labelformat=empty}
	\begin{subfigure}[b]{1.0\textwidth}
		%% trim=left bottom right top
		\includegraphics[width=\textwidth, clip=true, trim=0mm 0mm 0mm 0mm]{timeseries_regression_airline_12_nnsk}
		\caption{Neural Network based Regression}
		\label{fig:nnsk}
	\end{subfigure} \\
	\begin{subfigure}[b]{1.0\textwidth}
		\includegraphics[width=\textwidth, clip=true, trim=0mm 0mm 0mm 0mm]{timeseries_regression_airline_12_rfor}
		\caption{Random Forest Regression}
		\label{fig:rfor}
	\end{subfigure}
	\caption{Airline regression forecast}
	\label{fig:regression}
\end{figure}

\end{document}
